In an executive summary a panel of experts recommended Elimination of the terms partial and marginal previa and retaining only the terms placenta previa and low-lying placenta
- If the placental edge is less than 2 cm from the internal os but not covering the internal os, the placenta should be labeled as low-lying, and follow-up ultrasonography is recommended at 32 weeks of gestation.
- “If the placental edge covers the internal cervical os, the placenta should be labeled as placenta previa, and follow-up ultrasonography is recommended at 32 weeks of gestation. “
The panel also issued opinions on soft markers used to evaluate the risk for Down syndrome in fetuses.
- Isolated soft markers that are of no importance in the absence of an elevated a priori risk for fetal aneuploidy are choroid plexus cyst and echogenic intracardiac foci.
There is no need for ultrasonographic follow-up in fetuses with isolated choroid plexus cysts, because the cysts almost always resolve.
- When mild pyelectasis is identified, a targeted ultrasound study to rule out other structural abnormalities and correlation with aneuploidy screening results should be done. Follow-up ultrasonography at 32 weeks of gestation to rule out persistent pyelectasis should be performed. If the renal pelvis measures 7 mm or greater at the 32-week examination, postnatal follow-up is suggested because of correlation with postnatal renal disease.
Other important recommendations given by the panel may be found in the article available at:
REFERENCE: Reddy UM, etr al. Fetal imaging: Executive Summary of a joint Eunice Kennedy Shriver National institute of child health and human development, society for maternal-fetal medicine, american institute of ultrasound in medicine, american college of obstetricians and gynecologists, american college of radiology, society for pediatric radiology, and society of radiologists in ultrasound fetal imaging workshop. J Ultrasound Med. 2014 May;33(5):745-57. PMID:24764329